書誌事項
- タイトル別名
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- Study of the Fine Structure of Human Deciduous Dentin with Dentinogenesis Imperfecta, with Special Reference to the Mantle Dentin
- 外套象牙質を中心として
抄録
A lower deciduous inciser exhibiting dentinogenesis imperfecta (D. I) obtained from a 6-year-old boy with osteogenesis imperfecta (Shields' Type I) was examined by means of light microscopy (LM), scanning electron microscopy (SEM), and Xray microanalysis (XMA).<BR>With LM, the dentin displayed a sparse and irregular tubular pattern near the dentinoenamel juncton (DEJ) and only few or no tubular structures in the area corresponding to the circumpulpal dentin. Between these two areas, cleft-like structures were characteristically noted. Structural irregularities in the dentinal tubules were also shown with SEM observation.<BR>XMA demonstrated that the distribution of both Ca and P in the dentin of DI teeth was apparently lower than that in the normal deciduous incisor used as a control. Specifically, an area along EDJ at a distance of 25-35μm, corresponding to the mantle dentin, revealed extremely low or no distribution of the both elements.<BR>From the present observation, it is suggested that the genetric disorder mainly involved in the primary odontoblasts and consequently results in the disturbance of calcification, especially that mediated by the matrix vesicles, and shortening of the cell life. After the death of these cells, the cells originat in, from the undifferentiated pulp cells may participate in the deposition of another irregular dentin.
収録刊行物
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- The Japanese Journal of Pediatric Dentistry
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The Japanese Journal of Pediatric Dentistry 28 (2), 305-312, 1990
The Japanese Society of Pediatric Dentistry